<html>
    <head>
        <title>upload files</title>
    </head>
    <body>
        <form action="http://localhost:8080/upload" method="post" enctype="multipart/form-data">
            <p>
                username: <input type="input" name="username" />
            </p>
            <p>
                avatar: <input type="file" name="avatar" />
            </p>
            <p>
                file: <input type="file" name="file[]" />
            </p>
            <p>
                file: <input type="file" name="file[]" />
            </p>
            <p>
                <button type="submit" value="upload">
            </p>
        </form>
    </body>
</html>
